[PATCH 29/37] drm/mipi-dsi: notify about DSI attach

[Luca Ceresoli]

In preparation to support DRM bridge hotplug, let the drm_mipi_dsi code
emit an event when a DSI device is attached to the corresponding DSI host,
so that this event can trigger the actions needed to deconfigure the
pipeline and unregister the connector as appropriate.

Signed-off-by: Luca Ceresoli <luca.ceresoli at bootlin.com>
---
 drivers/gpu/drm/Kconfig        | 1 +
 drivers/gpu/drm/drm_mipi_dsi.c | 3 +++
 2 files changed, 4 insertions(+)

diff --git a/drivers/gpu/drm/Kconfig b/drivers/gpu/drm/Kconfig
index 3093d5f30724..288845b6621b 100644
--- a/drivers/gpu/drm/Kconfig
+++ b/drivers/gpu/drm/Kconfig
@@ -45,6 +45,7 @@ config DRM_MIPI_DBI
 config DRM_MIPI_DSI
 	tristate
 	depends on DRM
+	select DRM_EVENT_NOTIFIER
 
 config DRM_KMS_HELPER
 	tristate
diff --git a/drivers/gpu/drm/drm_mipi_dsi.c b/drivers/gpu/drm/drm_mipi_dsi.c
index 3ac1dd5ad640..eaa474da4a51 100644
--- a/drivers/gpu/drm/drm_mipi_dsi.c
+++ b/drivers/gpu/drm/drm_mipi_dsi.c
@@ -34,6 +34,7 @@
 #include <linux/slab.h>
 
 #include <drm/display/drm_dsc.h>
+#include <drm/drm_event_notifier.h>
 #include <drm/drm_mipi_dsi.h>
 #include <drm/drm_print.h>
 
@@ -386,6 +387,8 @@ int mipi_dsi_attach(struct mipi_dsi_device *dsi)
 
 	dsi->attached = true;
 
+	drm_event_notifier_notify(DRM_MIPI_DSI_ATTACHED, dsi);
+
 	return 0;
 }
 EXPORT_SYMBOL(mipi_dsi_attach);

-- 
2.54.0